On 28th April 2021 after midday we will be updating the server SSL certificate used for all web access (i.e. web service calls) on the TEST (i.e. test-au and test-au-fip) endpoints.
On the 5th May we will be updating the server SSL certificates on the PRODUCTION (au, and au-fip) endpoints. The update is required due to the upcoming expiry of the current certificate.
The intermediate CA for the certificate is not changing so there should not be any impact to your web service calls.